Concrete railroad-tie.



J. B. POPE.

GONGBETB RAILROAD TIE.

APPLICATION FILED APB-5, 1909.

Patented July '20;

ANDREW- u. GRAMAM 00,. FHOTO-LIYHDGRAPHERB. WASHINGTON u. c.

JAMES B. POPE, OF SAN FRANCISCO, CALIFORNIA.

CONCRETE RAILROAD-TIE.

Specification of Letters Patent.

Patented July 20, 1909.

Application filed. April 5, 1909. Serial No. 487,975.

To all whom it may concern:

Be it known that I, J nuns B. Porn, a citizen of the United States,residing at San Francisco, in the county of San Francisco and State ofCalifornia, have invented new and useful Improvements in ConcreteRailroad-Ties, of which the following is a specification.

The present invention relates to improvements in concrete railroad ties.One objection to such ties, as heretofore constructed, is that they arenot sufiiciently yielding to the impacts and jars of the rolling stock,and consequently cause excessive wear of said rolling stock.

The object of the present improvement is to avoid these objections tosuch ties.

In the accompanying drawing, Figure l is a plan view of my improved tie,showing part of a rail secured thereon; Fig. 2 is a longitudinal centralsection of the same;

Fig. 3 is a cross section of thesame on the line 33 of Fig. 1.

Referring to the drawing, 1 indicates a concrete bed section, formed atthe top with a longitudinal recess 2, occupying the whole of the topexcept narrow strips 3 at the ends and sides. This recess is filled withsand, or other durable loose material, as shown at 4, and, resting onsaid sand, and fitting within said recess, are two tie sections 5. Thesections 5 are identical in form and each 0ccupies one-half of therecess in the bed section. The adjoining ends 6 of the tie sections areformed with registering recesses 7 forming a key way to receive a key 8,which is also formed of concrete, and comprises a central narrow portion9 and flaring terminalportions 10, the key way corresponding in shapewith said key. The sides of the key slope inwardly downward, as shown at11, e11- abling the key to be fitted in the key way to hold the twosections firmly together, while permitting the removal of the key whendesired, handle bars 21 being provided for that purpose.

Each section 5 is formed with a transverse recess 12 adapted to receivea wooden block 13 forming a cushion. These blocks may differ inthickness on opposite sides of the track, at curves therein, to providethe necessary superelevation on the outer side. Upon each block l3restsa standard tie plate 14:, upon which is laid the rail 15. Clamps 16 restupon the margins 17 of said tie plate and extend over the flanges of therail.

Bolts 18, having their heads 19 beneath the tie sections, extend throughthe concrete tie section, block, tie plate, and clamps, and upon theupper ends of said bolts are screwed nuts 20.

The wooden blocks 13 form cushions to yieldingly support the rails uponthe tie sections, and the sand or other durable loose material in theconcrete bed forms a cushion for the tie sections- Moreover, the tie,being made in sections keyed together, is fiexi-' ble and yields to thevarying pressures upon the two rails. Hence there results greaterdurability in the tie itself and the prevention of undue wear upon therolling stock.

1. A concrete tie comprising a lower concrete portion, an upper concreteportion, and a cushion of yielding material between them, substantiallyas described.

2. A concrete tie comprising a lowerconcrete portion having a recess, anupper concrete portion sliding vertically in said recess, and a cushionin said recess upon which the upper portions rest, substantially as.described.

3. A concrete tie comprising a lower portion, formed with a recess inthe whole of the top except narrow marginal strips at the sides andends, an upper portion fitting snugly in said recess, and a cushion ofyielding material in said recess and supporting said upper portion,substantially as described.

4. A concrete tie divided into two sections, one for each rail, saidsections having abutting ends formed with coregistering recesses, and akey fitting said recesses, substantially as described.

A concrete tie divided into two sections, one for each rail, the joinedends of said sections having registering recesses,and a concrete keyfitting said recesses, substantially as described.

6. A concrete tie divided into two sections, one for each rail, thejoined ends of said sections having registering recesses, and a key Intestimony whereof I have hereunto set fitting said recesses, and havingdownwardly my hand in the presence of two subscribing 1i convergingWalls, substantially as described. Witnesses.

7 A concrete tie dividedinto two sections an P 5 one for each rail theo1ned ends of sald sec- JA I S B OPE (ions having registering recesses,and a key fitnesses: fittlng sald recesses, and havlng enlarged 1*. M.WRIGHT, ends, substantially as described. D. F. .hoinums.

